Civil Services Prep

Prelims MCQ · Geography

Middle- and low-latitude oceans commonly contain a warm surface layer, a thermocline and a cold deep layer. In the Arctic and Antarctic regions, surface-water temperature is close to 0°C and changes only slightly with depth.

Which one of the following conclusions is most appropriate?

  1. Polar oceans possess a stronger thermocline than tropical oceans because their surface water is colder.
  2. A warm surface layer of 20–25°C persists throughout the year in all middle- and high-latitude oceans.
  3. Temperature increases rapidly below the thermocline because deep water receives more solar energy.
  4. A pronounced thermocline depends on a substantial contrast between warm surface water and cold deep water and is weak or absent in polar oceans.
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